1 /* $NetBSD: info_passwd.c,v 1.1.1.3 2015/01/17 16:34:15 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1997-2014 Erez Zadok 5 * Copyright (c) 1990 Jan-Simon Pendry 6 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine 7 * Copyright (c) 1990 The Regents of the University of California. 8 * All rights reserved. 9 * 10 * This code is derived from software contributed to Berkeley by 11 * Jan-Simon Pendry at Imperial College, London. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * 38 * File: am-utils/amd/info_passwd.c 39 * 40 */ 41 42 /* 43 * Get info from password "file" 44 * 45 * This is experimental and probably doesn't do what you expect. 46 */ 47 48 #ifdef HAVE_CONFIG_H 49 # include <config.h> 50 #endif /* HAVE_CONFIG_H */ 51 #include <am_defs.h> 52 #include <amd.h> 53 54 #define PASSWD_MAP "/etc/passwd" 55 56 /* forward declarations */ 57 int passwd_init(mnt_map *m, char *map, time_t *tp); 58 int passwd_search(mnt_map *m, char *map, char *key, char **pval, time_t *tp); 59 60 61 /* 62 * Nothing to probe - check the map name is PASSWD_MAP. 63 */ 64 int 65 passwd_init(mnt_map *m, char *map, time_t *tp) 66 { 67 *tp = 0; 68 69 /* 70 * Recognize the old format "PASSWD_MAP" 71 * Uses default return string 72 * "type:=nfs;rfs:=/${var0}/${var1};rhost:=${var1};sublink:=${var2};fs:=${autodir}${var3}" 73 */ 74 if (STREQ(map, PASSWD_MAP)) 75 return 0; 76 /* 77 * Recognize the new format "PASSWD_MAP:pval-format" 78 */ 79 if (!NSTREQ(map, PASSWD_MAP, sizeof(PASSWD_MAP) - 1)) 80 return ENOENT; 81 if (map[sizeof(PASSWD_MAP)-1] != ':') 82 return ENOENT; 83 84 return 0; 85 } 86 87 88 /* 89 * Grab the entry via the getpwname routine 90 * Modify time is ignored by passwd - XXX 91 */ 92 int 93 passwd_search(mnt_map *m, char *map, char *key, char **pval, time_t *tp) 94 { 95 char *dir = NULL; 96 struct passwd *pw; 97 98 if (STREQ(key, "/defaults")) { 99 *pval = xstrdup("type:=nfs"); 100 return 0; 101 } 102 pw = getpwnam(key); 103 104 if (pw) { 105 /* 106 * We chop the home directory up as follows: 107 * /anydir/dom1/dom2/dom3/user 108 * 109 * and return 110 * rfs:=/anydir/dom3;rhost:=dom3.dom2.dom1;sublink:=user 111 * and now have 112 * var0:=pw-prefix:=anydir 113 * var1:=pw-rhost:=dom3.dom2.dom1 114 * var2:=pw-user:=user 115 * var3:=pw-home:=/anydir/dom1/dom2/dom3/user 116 * 117 * This allows cross-domain entries in your passwd file. 118 * ... but forget about security! 119 */ 120 char *user; 121 char *p, *q; 122 char val[MAXPATHLEN]; 123 char rhost[MAXHOSTNAMELEN]; 124 dir = xstrdup(pw->pw_dir); 125 126 /* 127 * Find user name. If no / then Invalid... 128 */ 129 user = strrchr(dir, '/'); 130 if (!user) 131 goto enoent; 132 *user++ = '\0'; 133 134 /* 135 * Find start of host "path". If no / then Invalid... 136 */ 137 p = strchr(dir + 1, '/'); 138 if (!p) 139 goto enoent; 140 *p++ = '\0'; 141 142 /* 143 * At this point, p is dom1/dom2/dom3 144 * Copy, backwards, into rhost replacing 145 * / with . 146 */ 147 rhost[0] = '\0'; 148 do { 149 q = strrchr(p, '/'); 150 if (q) { 151 xstrlcat(rhost, q + 1, sizeof(rhost)); 152 xstrlcat(rhost, ".", sizeof(rhost)); 153 *q = '\0'; 154 } else { 155 xstrlcat(rhost, p, sizeof(rhost)); 156 } 157 } while (q); 158 159 /* 160 * Sanity check 161 */ 162 if (*rhost == '\0' || *user == '\0' || *dir == '\0') 163 goto enoent; 164 165 /* 166 * Make up return string 167 */ 168 q = strchr(rhost, '.'); 169 if (q) 170 *q = '\0'; 171 p = strchr(map, ':'); 172 if (p) 173 p++; 174 else 175 p = "type:=nfs;rfs:=/${var0}/${var1};rhost:=${var1};sublink:=${var2};fs:=${autodir}${var3}"; 176 xsnprintf(val, sizeof(val), "var0:=%s;var1:=%s;var2:=%s;var3:=%s;%s", 177 dir+1, rhost, user, pw->pw_dir, p); 178 dlog("passwd_search: map=%s key=%s -> %s", map, key, val); 179 if (q) 180 *q = '.'; 181 *pval = xstrdup(val); 182 return 0; 183 } 184 185 enoent: 186 XFREE(dir); 187 188 return ENOENT; 189 } 190